Letterbox Lock by Interlock

52 total reviews

$80.00 SGD

Sale Sold out

Access Modes

Pincode

Key Highlights

Battery-Free Lock: No need to worry about battery replacements, offering hassle-free security.
Durable Zinc Alloy Build: Long-lasting and resistant to wear, ensuring your mailbox lock is reliable.
Keyless 3-Digit Combination: Enjoy easy access with a secure and convenient digital number lock.
Perfect for Urban Living: Designed for HDB, BTO, resale flats, and condo letterboxes.
HDB-Compatible – Perfect for HDB mailbox lock and HDB letterbox lock installations.
Affordable & Professional Installation: Priced at $80 with installation included, delivering excellent value for a letterbox lock.

What's Included

1 Letterbox Lock
Delivery & Equipped For You

Additional Features

Weather-Resistant Finish – Withstands Singapore’s humid, coastal climate.
Low-Profile Aesthetic – Blends seamlessly with any letterbox design.
Code-Reset Tool – SIM-pin tool for quick, secure password changes.

Description

Battery-Free Letterbox Lock for HDB & Condo Mailboxes

Change your HDB letterbox lock with our letterbox lock, a battery-free and keyless solution tailored for HDB, BTO, resale flats and condo letterboxes. Unlike most digital letterbox lock, this letterbox lock eliminates the hassle of replacing batteries and carrying keys, offering a convenient and reliable way to secure your mail.

Made from premium zinc alloy, this letterbox lock provides enhanced durability and long-term security. Its easy-to-use 3-digit combination ensures hassle-free access while maintaining a sleek and modern design. Ideal for urban living, this lock for letterboxes is perfect for Singapore residents looking for a low-maintenance yet secure option.

Priced at just $80, this affordable letterbox number lock is a simple yet impactful upgrade to your home. Whether you're securing an HDB or condo letterbox, enjoy the benefits of a high-quality letterbox lock that delivers both peace of mind and convenience.

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Note: Product visuals are presented for illustrative purposes only and may vary slightly in colour, finish, proportions, and final installed appearance. For the most realistic representation, please refer to our Customer Gallery featuring actual installation photos.

Frequently Asked Questions

Have Questions? We're Here to Help You.

Whether you need a letterbox lock for an HDB flat or a digital lock for letterbox in a condo, our design delivers low-maintenance, high-security performance. Say goodbye to keys, batteries, and bulky hardware—upgrade today for seamless mail protection.

The lock ships with a default code of 0-0-0.

- Ensure the lock is open (default code is 0-0-0).
- Find the pin hole on the side of the front lock turntable.
- Insert a pointed tool (e.g., SIM-tray pin) into the hole and hold.
- If it does not give, turn the knob slightly and retry.
- While holding, set your new 3-digit code and release to confirm.

Yes—our dimensions match standard HDB mailbox lock cutouts.

We recommend our $80 installation package for perfect alignment and warranty coverage.

No—being battery-free and fully mechanical, it only needs occasional cleaning for optimal performance.

Being a battery-free letterbox lock, we do not need any batteries to be used. Saves your hassle and your time.

How Does Our Letterbox Lock Work?

This combination lock for letterbox relies on precision-engineered dials that engage a mechanical latch inside the zinc-alloy housing. Each numbered wheel must align to the correct 3-digit code before the latch retracts, ensuring both reliability and longevity. Without batteries or electronics, the lock is impervious to power failures and battery-related maintenance—ideal for a letter box lock Singapore solution that works year after year.

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